Eye refractive power measurement device

Abstract

The present invention provides a compound device having an eye refractive power measurement function and an eye accommodation function state measurement function, preventing an increase in size and cost in comparison with a known eye refractive power measurement device, and convenient for the operator even when the measurement type is changed. An eye refractive power measurement device includes a measurement type select switch (30) which selects one of at least two types of measurements including normal refractive power measurement, which measures the refractive power of the subject s eye including spherical power, cylinder power, and astigmatism axis, and eye accommodation function state measurement, which determines a change in the refractive power of the subject s eye for high-frequency components. A refractive power measurement section (40) is a multiple meridian direction refractive power measurement section which can measure the eye refractive power in two or more meridian directions. The multiple meridian direction refractive power measurement section measures the refractive power in at least two meridian directions when performing the normal refractive power measurement. The multiple meridian direction refractive power measurement section measures the refractive power in one predetermined meridian direction when performing the eye accommodation function state measurement.

Description

TECHNICAL FIELD[0001]The present invention relates to an eye refractive power measurement device which measures the refractive power and the accommodation function state of the subject s eye.BACKGROUND ART[0002]In the field of medical treatment such as ophthalmology, a refractive power measurement device which measures the eye refractive power has been widely used. An example of the refractive power measurement device is a refractive power measurement device using retinoscopy such as the types disclosed in patent documents 1 and 2. In the field of medical treatment including ophthalmology, measurement of the eye accommodation function state has also been demanded as a more detailed refraction state. For example, a device which objectively measures the eye accommodation function state has been proposed, such as an eye accommodation function state measurement device disclosed in patent document 3.[0003]In eye accommodation function state measurement, the eye refractive power is contin...

AI Technical Summary

Benefits of technology

[0010]An objective of the present invention is to provide a compound device having an eye refractive power measurement function and an eye accommodation function state measurement function, preventing an increase in size and cost in comparison with a known eye refractive power measurement device, and convenient for the operator even when the measurement type is changed.

[0019]According to the present invention, a compound device having an eye refractive power measurement function and an eye accommodation function state measurement function can be provided which prevents an increase in size and cost in comparison with a known eye refractive power measurement device and is convenient for the operator even when the measurement type is changed.

Problems solved by technology

And in the meantime the high-frequency components cannot to be obtained unless the measurements are continuously performed.

Therefore, since it is difficult to directly apply a known eye refractive power measurement device to an eye accommodation function state measurement device, an eye refractive power measurement device must be improved or modified so that continuous measurement can be performed at higher speed.

This results in an increase in size and cost in comparison with a known device.

A compound device may suffer from a display difficulty if the normal refractive power measurement is performed at high speed in the same manner as the eye accommodation function state measurement device.

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